ELS27 Adapter Revision 5.0 replaces the popular ELS27 version 4.0.
A new generation device with redesigned circuitry and additional protection, as well as an updated case. All adapters are produced in St. Petersburg.
When purchasing with a wireless module, the module will be installed in the device.
What has been added and changed:
- Despite the fact that the adapter operates at USB 2.0 speeds, the transition to USB-C is justified by its convenience and the growing popularity of this standard. Finding a replacement for a MicroUSB cable is becoming increasingly difficult, which cannot be said about Type-C
- The protocol diagram has been redesigned and the connection (jumper) Pin 8 - Pin 9, as well as Pin 7 - Pin 12, has been removed. The mechanical relay has also been replaced with a separate transceiver and another one has been added for the CAN line on pins 12/13 (often used in Renault)
- Flash and EEPROM Programming Signal (FEPS) is a signal for switching ECU units into programming mode. It is used for Ford units before 2011
- The flashlight operates from 5V USB and helps to see the car's OBD connector in the dark. The flashlight itself cannot be switched off, and we selected a brightness that would shine sufficiently, but would not blind or consume much. When powered by the adapter from OBD (with a wireless module installed in the adapter), it remains off
In all other respects, the adapter remains the same ELS27, which is well known and has earned a good reputation. Each adapter still undergoes a full check before sale and has a 1-year warranty.
Main features and capabilities of the adapter:
- full compatibility with ELM327, ELS27 performs all functions of ELM327
- the adapter is assembled on the original STN2120 processor by ScanTools
- ELS27 supports KKL mode for cars that are diagnosed via K and L lines, for example, old VAG and others
- supports all CAN buses (HS CAN, MS CAN, SW CAN, MM CAN) without external switches and jumpers, the adapter has a built-in multiplexer
- works at high speeds (up to 8 Mbps)
The ELS27 adapter is supported by many programs, including Forscan, FoCCCus, ELM config, Stool, ELM-FFn. Many program authors add ELS27 to the list of supported equipment, as the adapter has an excellent price/quality ratio. Please note that neither our store nor the ELS27 manufacturer are the authors of diagnostic programs. Almost all programs are distributed for free, program support and answers to questions can be found on forums and websites of program authors.
Many sellers position ELS 27 as a scanner for Ford and Mazda, but we do not agree with this - ELS27 is a universal diagnostic scanner. This opinion arose because there are many programs with very deep functionality for Ford and Mazda. The adapter is very popular among Ford club enthusiasts.
Package includes:
- ELS27 adapter revision 5.0
- Cable USB-C
- Adapter USB-A
Important:
This function is available only on certain BMW engines and is NOT applicable to other vehicle brands.
The information below applies only to stock engines with factory ECU software and a standard exhaust system.
What This Parameter Actually Represents
This is NOT a direct measurement of fuel octane and is NOT a direct octane reading calculated by the ECU.
The value is an adaptation factor ranging from 0 to 1, where:
- 0 = no correction
- 1 = maximum correction
According to BMW’s internal definition:
Faktor adaptierte Kraftstoffqualität (0 = ROZ98 / 1.0 = ROZ91)
- 0 corresponds to 98 ROZ
- 1.0 corresponds to 91 ROZ
ROZ is the German equivalent of RON (Research Octane Number).
The device converts this multiplier into a more intuitive octane value for user convenience.
⚠️ The device does not measure anything itself.
It only displays the data provided by the engine control unit (ECU).
How the ECU Evaluates Fuel Quality
Each ECU has different calibration sensitivity:
- Sensitivity to the adaptation factor
- Sensitivity of the knock control system
Fuel quality is evaluated subjectively by the ECU, primarily based on:
- Knock ignition timing corrections
- Overall engine noise levels
BMW G-Series & LCI F-Series (B-Engines)
B38 / N63 / S63 / N74
These engines are highly sensitive to octane adaptation.
- During warm-up and cruising, the displayed octane may frequently drop to 95 or lower.
- This does NOT automatically indicate poor fuel quality.
- Under load, the value should increase.
⚠️ If the value continues to decrease under load, this may indicate a problem.
B46 / B48 / B58
These engines have low sensitivity.
- During cruising, octane will typically display maximum values even with mediocre fuel.
- Under load, the value will decrease if fuel quality is truly poor.
S58
Octane correction is virtually inactive.
- It will typically always show 98.
- If it drops below 98, fuel quality is genuinely very poor.
BMW F-Series (Pre-LCI) with N/S Engines
Most pre-LCI F-series ECUs do not calculate octane adaptation.
Do not expect this parameter to function.
S55
- Octane parameter not used by the system
- Display not supported
- However, display of the last 5 refueling quality events is supported
S63
- Octane parameter not used
- Display not supported
- Refueling quality display not supported
BMW E-Series
Octane parameter not available. Display not supported.
Important Notes About Tuned Vehicles
With modified hardware or custom tuning, behavior may vary significantly. Always consult your tuner regarding expected operation.
Key principles:
- If octane drops under load, it means fuel quality is worse than expected under those conditions.
- This does NOT automatically mean the fuel itself is bad.
Examples:
- If a tuner increases ignition timing and boost pressure, even good fuel may cause knock corrections, and the ECU may interpret it as poor fuel.
- Thin-walled or poorly mounted exhaust systems may create parasitic noise, which the ECU may interpret as engine knock, causing negative correction.
- Conversely, if knock sensitivity is reduced or octane correction is disabled in tuning, readings may appear ideal while actual engine safety is compromised.
